半人馬座阿爾法星:最接近的恆星系統
Alpha Centauri: The Closest Star System
來源:Telescope Live, Heaven's Mirror Observatory;
Processing: Chris Cantrell|發表日期:2025-01-01
距離太陽最近的恆星系統是半人馬座阿爾法星系。在該星系的三顆恆星中,最暗淡的一顆--半人馬座比鄰星--實際上是距離太陽最近的恆星。明亮的半人馬座阿爾法星 A 和 B 形成了近雙星,因為它們之間的距離只有地球和太陽距離的 23 倍--略大於天王星和太陽之間的距離。在北半球的大部分地區看不到阿爾法星系。半人馬座阿爾法星 A,又名金牛座,是半人馬座中最亮的恆星,也是夜空中第四亮的恆星。天狼星最亮,儘管它比天狼星遠一倍多。一個令人興奮的巧合是,半人馬座阿爾法星 A 與我們的太陽屬於同一型別的恆星,而半人馬座比鄰星現在已知有一顆可能適合居住的系外行星。
原文:The closest star system to the Sun is the Alpha Centauri system. Of the three stars in the system, the dimmest -- called Proxima Centauri -- is actually the nearest star. The bright stars Alpha Centauri A and B form a close binary as they are separated by only 23 times the Earth- Sun distance - slightly greater than the distance between Uranus and the Sun. The Alphasystem is not visible in much of the northern hemisphere. Alpha Centauri A, also known as Rigil Kentaurus, is the brightest star in the constellation of Centaurus and is the fourth brightest star in the night sky. Sirius is the brightest even though it is more than twice as far away. By an exciting coincidence, Alpha Centauri A is the same type of star as our Sun, and Proxima Centauri is now known to have a potentially habitable exoplanet.
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